<div class="card-header d-flex justify-content-between align-items-center">
    <h2 class="text-center flex-grow-1">后台管理系统</h2>
    <div class="d-flex align-items-center">
        <h4 th:text="${session.username}" class="d-inline mb-0 me-2"></h4>
        <img th:src="@{/img/a.png}" width="100" height="100"/>
        <a th:href="@{/Student/logout}" class="text-decoration-none">退出</a>
    </div>
</div>